Double-action stop motion attachment for spinning frames or twisters



y 10, 1951 J B DALTON 2,559,949

DOUBLtE-ACTION S TOI MOTION ATTACHMENT FOR SPINNING FRAMES OR TWISTERS Filed June 16, 1950 3 Sheets-Sheet l Inventor Jose oh B. Dal-Furl Attorney July 10, 1951 J. B. DALTON 2,559,949 DOUBLE-ACTION STOP MOTION ATTACHMENT FOR SPINNING FRAMES 0R TWISTERS 4 Filed June 16, 1950 3 Sheets-Shee t 2 Inventor v dairy 7 .5. Dalia/z By M )1.

Attorney J. B. DALTQN DOUBLE-ACTION STOP MOTION ATTACHMENT FOR Jul 10, 1951- SPINNING FRAMES OR TWISTERS .5 Sheets-Sheet 3 Filed June '16, 1950 Inventor Attorney Patented July 10, 1951 OFFICE DOUBLE-ACTION STOP MOTION AT- TACHMENT FOR SPINNING FRAMES R TWISTERS Joseph is. naltcn, Spindale, N. 6.

Application June 16, 1950, Serial No. 168,511

11 Claims. 1

This invention relates to a stop motion attachment adapted to be mounted on and function with conventional spinning frames, twisters and similar machines employed in winding of bobbins and similar thread packages commonly known as filling wound thread packages.

More particularly, it is an aim of the present invention to prevent waste of yarn caused by the yarn running over the upper end of the bobbin which results in tangling and loss of time in unwinding the yarn by providing means to stop the ring rail after a predetermined amount of yarn has been wound onto the bobbin and which will stop the ring rail in a position so that the loose ends of the yarn will be disposed intermediate of the ends of the bobbin and. at a substantial distance from the outer, tip end.

Still a further object of the invention is to provide an apparatus whereby the point of stoppage of the ring rail can be varied to suit the particular need.

Still a further object of the invention is to provide an attachment which is constructed to take advantage of the conventional movement of spinning frames and twisters, known as a builder motion to cause said attachment to assume a position for interrupting the operation of the spinning frame or twister when the filling of the bobbin has been completed.

Various other objects and advantages of the invention will hereinafter become more fully apparent from the following description of the drawings, illustrating a presently preferred embodiment thereof, and wherein:

Figure 1 is a side elevational view of the attachment shown applied to a conventional spinning frame, a part of which is illustrated in side elevation;

Figure 2 is an enlarged side elevational view of a portion of the attachment, looking in the same direction as Figure 1;

Figure 3 is a top plan view of the parts as seen in Figure 2;

Figure 4 is a vertical sectional view on an enlarged scale taken substantially along a plane as indicated by the line 4-4 of Figure 1, and

Figure 5 is a horizontal sectional View on an enlarged scale taken substantially along a plane as indicated by the line 5-5 of Figure 1 and showing a part of the attachment in top plan.

Referring more specifically to the drawings, the double action stop motion attachment in. its entirety and as illustrated in Figure l is designated generally It. In order to illustrate mounting of the attachment 1 E3 and to clearly set forth the operation with a conventional spinning frame, a portion of such a frame has beenillustrated in Figure 1 and which is designated generally II. The spinning frame H includes an electric motor I 2 which is suitably supported in a stationary position and provided with pulleys it which are connected to and driven from the armature shaft of the motor for driving pulleys It which are disposed thereabove by means of the endless belts l5. The pulleys M are fixed to an end of a spindle 16 which extends from one end of a cylinder l1 and which is journaled in a portion of the end Samson l3 of the spinning frame whereby the cylinder 11 is revolved for operation of the electric motor 2. .The spinning frame I i has the usual rail l9 which is supported by and projects from one side of the end Samson IS, in the upper section of which are journaled upright spindles 2U. Bobbins 2! are mounted on are trained an endless belt 23 which is trained around the cylinder I? for driving the spindles and bobbins from said cylinder. The operation of the motor i2 is controlled by a conventional magnetic switch 24 and a master switch 25, which switches are supported on the end Samson I 8. A spinning rail 26 has rings 21 which are disposed around the bobbins 2i, said spinning rail being reciprocated upwardly and downwardly to give traverse to yarn, these movements being imparted to the spinning or ring rail 26 by the builder motion of the machine of which the parts 28, 25, 39, 3!, 32 and 33 constitute a part. The yarn is passed through a traveler, not shown, on the rings 21 and is thus deposited onto the bobbins 2i An electric current is supplied to the motor 12 through the master switch 25 and magnetic switch 24. A cross brace or bar 34 extends between complementary portions of the top and bottom sections of the rail l9 and constitutes a part thereof. The conventional parts of the spinning frame H, including the parts 12 to 34, inclusive, have not been illustrated in detail and have only been briefly described, sufficiently to afiorda full understanding of the construction and operation of the stop motion attachment Hi; constituting the invention and hereinafter to be described.

The stop motion attachment [0 constitutes three separate units designated generally 35, as and 31. The unit 35 includes a bracket 38 having a flange or side 39 which is disposed against and detachably and adjustably secured to one side of the traversechain bar 28, said bracket side 39 having a longitudinal slot 48 therein for receiving a plurality of fastenings 4! by which it is detachably and adjustably fastened to the bar 28. The other flange 42 of the bracket 38 extends horizontally outwardly from the upper edge of the flange 39 and away from the bar 28 and is provided with corresponding slots 43 which extend at right angles to the bar 28 and through which extends headed screw fastenings 44. The screw fastenings 44 extend downwardly through a supporting block 45, which rests upon the flange 42, thence loosely through the slots 43 and the threaded lower ends of the screws 44 engage threaded openings 46 in a clamping block 41, which is disposed beneath the flange 42 so that the fastenings 44 may be tightened for clamping the supporting block 45 to the upper side of the flange 42. Accordingly, said supporting block 45 may be acljustably clamped to the flange 42 at different laterally spaced points from the bar 28.

A stud 48 has a restricted stem 49 projecting from one end thereof and which extends through the intermediate portion of the block 45, between the fastenings 44, so that the stud 48 projects from the side of the block 45 remote to the bar 28. A retaining collar 58 is adjustably secured to the shank 49 by a setscrew between the block 45 and bar 28, to retain the stud 48 on said block 45. The stud 48 has an opening 52 extending transversely therethrough to reciprocably receive therein a rod 53 which is provided with a longitudinally extending groove 54, which extends from one end of the rod 53 to beyond its intermediate portion. A

screw 55 is threaded longitudinally into the stud 48 from its outer end and has its inner end engaging in the groove 54 to prevent rotation of the rod 53 in the stud 48, said screw 55 being held in adjusted position by a lock nut 56 carried thereby. A collar 51 is adjustably secured on the slotted end of the rod 53 by a setscrew 58 for limiting the sliding movement of said rod 53 from left to right of Figures 2 and 3. A roller catch member 59 is mounted on the rod 53 adjacent its opposite end and has a depending bifurcated portion in which is accommodated a roller 68 which is journaled on a pin or screw 6| which extends transversely through the lower portion of the member 59, so that a portion of the roller 98 beneath and on opposite sides of the member 59 is exposed. 'The roller catch member 58 is adjustably secured to the rod 53 by a setscrew 62. A contractile or tension spring 53 is mounted on the rod 53 between the stud 48 and roller catch 59 and has one end anchored to the stud 48 by a fastening 64 and its opposite end anchored to the roller catch 58 by a fastening 65, so that the spring 63 urges the rod 53 to move from right to left of Figures 2 and 3. A balance weight 66 is secured on the forward end of the rod 53, beyond the roller catch 59 by a setscrew 81. The stud shank 49 is turnably mounted in the supporting block 45, for a purpose which will hereinafter become apparent.

The unit or section includes a bracket. 68 having a slotted flange 69, corresponding in shape to the slotted flange 39 and the slot of which is engaged by the fastenings 4| for adjustably and detachably securing the bracket flange 89 to the opposite side of the chain bar 28. This bracket 88 is provided with a bottom flange 18 which projects outwardly from the bottom edge of the flange 89, away from thQ b8 28 and which is provided with parallel slots ll, disposed at right angles to the bar 28 for re ceiving screw fastenings 12 which extend downwardly therethrough and each of which is provided with a washer T3. The screws 72, which are longitudinally adjustable in the slots ll, extend downwardly therethrough and threadedly engage in a flange 14 of a hanger 15, which is disposed at a right angle to its flange 14 and which depends downwardly from the bracket flange 78. The screws 72 are tightened to adjustably clamp the flange F4 to the flange I8 and so that the hanger 15 may be adjusted laterally of the bar 28. A block "#8 is disposed against and transversely of the inner side of the hanger l5 and is secured thereto by screw fastenings 11 which extend through vertically elongated slots 18 in the hanger l5 so that the block 16 may be adjusted vertically with respect to the hanger. The block '86 supports a rod 19 which extends longitudinally therethrough and which is reciprocably disposed therein, said rod 79 having a longitudinally extending flattened portion 88 which is engaged by the inner end of a setscrew 83 which is threaded transversely into the block "it for adjustably positioning the ends of the rod 19, relatively to the block 16, said rod 79 being supported by the block 19 with its axis substantially parallel to the plane of the bottom edge of the bar 28. A trip head 82 is adjustably secured to the forward end of the rod i9 by a setscrew 83, said trip head 82 having a lateral extension which projects toward the bar 28 and which is provided with a beveled rear or inner side 84.

The unit 31, as best illustrated in Figures 4 and 5, includes a supporting plate 85 which is supported in substantially an upright position and. by means of its right angularly disposed flange 89 which is positioned against one side of the brace 34 and secured thereto by fastenings Bl. A push button switch 88 of any suitable, conventional construction is secured to the supporting plate 85, as by a fastening 89 and has a push button 99 which is spring biased to its projected position, as illustrated in Figure 5. The switch 88 is connected by conductor means 9| to the switch 24, said switch 88 being normally in a circuit closing position, as illustrated in the drawings so that it will not interrupt the current to the motor l2, except when actuated by either the unit 35 or 36 of the attachment H], as will hereinafter be described. An elongated U.-shaped support 92 is secured to the plate 85 by fastenings 93 and projects outwardly therefrom, just above the switch 88. A lever 94 is pivotally mounted intermediate of its ends in the outer portion of the member 92 by engaging the shank of a nut and bolt fastening 95, which extends therethrough and through the member 92. An adjusting screw 99, carrying a lock nut 9'! extends inwardly through the outer end of the member 92 to engage the lever 94 below its pivot tovary the movement of the lower end of the lever 94 away from the push button 98. A pin 98 extends through the upper portion of the lever 94 and has a tapered head 99 which projects: from the outer side of the lever 94. A contractile or tension spring I88 has one end fastened to the inner end of the pin 98 and extends downwardly and rearwardly therefrom and is. anchored at its opposite end by a fastening HH- to the supporting plate 85, so that the spring I88 tends to rock the lever 94 in a direction for swinging its lower end away from the push button 9B. A setscrew Hi2 may be utilized for anchoring the pin 98 in the upper end of the lever 94. An adjusting screw m3 extends inwardly through the lower end portion of the lever 84 and carries a lock nut Hi l for adjustably positioning its inner end relatively to the push button 9B.

A bracket arm IE5 has one end secured by fastenings led to the plate 85 and has an opposite end ml which is disposed transversely to one side of the switch 33, said portion It! having a housing 4 Elli fastened thereto and projecting outwardly therefrom. The housing tilt includes spaced top and bottom walls and is provided with open ends, through one of which ends extends a lever Hi9 and through the other of which ends extends a lever iiii. The levers I69 and H are swingably mounted within the housing I08 between its top and bottom walls on fastenings ill which extend loosely through the intermediate portions of said levers and which engage the top and bottom walls of the housing l 98. The levers Hi3 and 1 iii are provided with adjacently disposed ends having complementary arcuate recesses H2 between which is disposed a disk I93 which is slidably supported on the bottom wall of the housing N35. The lever M39 is provided with a tapered opposite, outer end lid and the lever H6 is provided with a restricted terminal H at its opposite, outer end which extends generally toward the push button 95.

The electric motor 52 is controlled by a lever, not shown, forming a part of the conventional spinning frame H and when the spinning frame H is being operated by the motor l2 in a conventional manner, the chain bar 28 as a part of the builder motion is reciprocated horizontally toward and away from the end Samson l8 and in its reciprocating movement, the bar 28 gradually advances toward the Samson i8. Accordingly, as the bar 28 moves toward the Samson E8 the units 35 and carried thereby will also be moved in the same direction and accordingly toward the unit 31. As a result, the roller 60 of the roller catch 59 will be gradually advanced to ward the unit 3'! until said roller 6B contacts the tapered pin 99 and as the advancing reciprocating motion continues, the roller 60 will roll over the tapered pin head 99 and over the upper end of the lever 5, the rod rocking in a vertical plane to accomplish this due to the fact that it is sup ported by the stud shank 59 which is journaledin the block After the roller 50 and roller catch 59 have passed completely over the upper end of the trip lever 9 the balancing weight 66 will cause the roller catch 59 to drop downwardly behind the trip lever 9 as it returns the rod 53 to its balanced position of Figure 2. Thereafter, as the chain bar 28 is moved away from the Samson It on its reciprocating movement, the roller catch 59 engages behind. the upper end of the trip lever Sid exerts a pull thereon so as to rock 1e trip lever counterclockwise as seen in Figure 1 thereby swinging the lower end toward the switch 32 so that the screw IE3 will force the outwardly spring biased plunger 90 inwardly to interrupt the electric circuit to the motor l2 and accordingly stopping operation of the spinning frame 5 i. It will be understood that the spring 9 is expanded or stretched after the roller catch has ridden over the upper end of the trip lever 94 so that the trip lever is not actuated to interrupt the circuit by operation of the switch 88 until the rod 5-3 has moved from left to right of Figures 2 and 3 until the collar 51 engages the stud 48 and prevents further movement thereof, after which the trip lever 94 is actuated to cause the switch button 90 to assume a circuit interrupting position. The spring 5% is of suflicient strength to overcome the strength of the spring 63 until the collar 5'! contacts the stud 8. Accordingly, by adjusting the collar 5? longitudinally on the rod 53, toward and away from the stud t8, the point of travel of the chain bar 28 at which the operation of the frame will be interrupted by the attachment it can be varied and accordingly the location of the spinning rail 26 relatively to the bobbins 2! will thus be varied at the instant that operation of the spinning frame is thus interrupted. After the trip lever 9 has been rocked sufficiently to actuate the switch 88 and while in this tilted position, the spring 63 will pull the roller catch 55? and roller 68 back over the upper end of the lever 94 and allow the rod 53 and parts carried thereby to resume their original positions as illustrated in the drawings.

During this normal operation of the spinning frame and the stop motion attachment It, as previously described, the unit 355 performs no function as said unit 36 only functions as an emergency stop motion means for substantially instantaneously interrupting operation of the spinning frame it by moving the switch button 99 to a circuit interrupting position in the event that the chain connected to the chain bar 28 breaks. When this occurs, the traverse chain bar 28 is released allowing it to move suddenly toward the Samson i8 and as such motion is not a reciprocating motion, the unit would obviously not function to actuate the switch button 99, as previously described; however, when this occurs, the traverse bar 28 will move suddenly from left to right of Figure l and in so moving, the head 32 will strike the tapered outer end N4 of the lever its and will cause said lever to swing clockwise on its pivot i I i, as seen meeting the adjacent ends of the levers I39 and H0 will cause the lever ii!) to simultaneously swing in a counterclockwise direction and with sumoient force so that its outer end H5 will strike and. force the switch plunger 9t inwardly to interrupt the electric circuit to the motor l2 to stop operation of the spinning frame it sub stantially instantaneously and before any appreciable waste of yarn can occur thereby minimizing the loss of time which would otherwise be involved in straightening out the yarn should the spinning frame it continue to operate after a chain breakage. It will be readily understood that the rod is is adjusted in the block l6 by the setscrew ill so that during normal operation of the spinning frame and the stop motion at= tachment re, the head $2 will not contact the lever end H4 and, as previously stated, the unit 36 will therefore not function. After the levers I99 and H0 have been rocked, as previously described by the head 82, the spring, not shown, of the plunger 8"? will possess suiiicientforce to return the levers to their positions of Figure 5 as the plunger 9Q resumes its normal circuit closing position. However, the spring biasing action of the push. button El will not return the levers ltd and lie to their positions of Figure 5 until after the broken traverse chain has been replaced.

Various modifications and changes are contemplated and may obviously be resorted to, without departing from the spirit or scope of the the appended frames and twisters comprising a first section adapted to be detachably and adjustably mounted on a stationary part of a spinning frame or twister and a second section adapted to be detachably and adjustably mounted on a part of the spinning frame or twister and which is advanced in one direction by a reciprocating motion while the spinning frame or twister is in operation, said first section including a supporting member detachably and adjustably mounted on the stationary part of the machine, an electric switch mounted on said supporting member and adapted to interrupt the operation of the machine, said switch having a spring projected push button and being disposed in a circuit closing position when said push button is projected, a lever having one end disposed in front of said switch and spaced from the push button, means mounted on said supporting member and pivotally supportin said lever intermediate of its ends; said second section including a bracket adapted to be detachably and adjustably mounted on the reciprocably movable part of the machine, and a lever actuating means adjustably supported by said bracket relatively to said movable machine part and disposed to engage the opposite end of the lever after a predetermined movement of said movable machine part in one direction relatively to the machine to rock said lever whereby the push button will be displaced inwardly to a circuit interruptlever actuating means including a stud swivelly supported on the bracket, a rod extending reciprocably through said stud and supported thereby parallel to the direction of travel of the movable machine part, a lever catch adjustably mounted on said rod, adjacent one end thereof, and having a portion depending from the rod, means for limiting the sliding movement of said rod relatively to the stud, said lever catch being disposed to ride over the last mentioned end of the lever when the movable machine part travels a predetermined distance in one direction during its reciprocating movement, said lever catch and rod rocking with the stud relatively to the bracket in passing over the last mentioned lever end and thereafter resuming a position with the lever catch disposed on the opposite side of said lever end and said lever end being actuated by reciprocating movement of the movable machine part in one direction after the adjustable stop means has restricted the slidin movement of the rod in the stud and whereupon the last mentioned lever end is engaged and actuated by said lever catch.

3. A stop motion attachment as in claim 1, said lever actuating means including a stud swivelly supported on the bracket, a rod extending reciprocably through said stud and supported thereby parallel to the direction of travel of the movable machine part, a lever catch adjustably mounted on said rod, adjacent one end thereof, and having a portion depending from the rod, means for limiting the sliding movement of said rod relatively to the stud, said lever catch being disposed to ride over the last mentioned end of the lever when the movable machine part travels a predetermined distance in one direction during its reciprocating movement, said lever catch and rod rocking with the stud relatively to the bracket in passing over the last mentioned lever end and thereafter resuming a position with the lever catch disposed on the opposite side of said lever end and said lever end being actuated by reciprocating movement of the movable machine part in one direction after the adjustable stop means. has restricted the sliding movement of the rod in the stud and whereupon the last mentioned lever end is engaged and actuated by said lever catch, said last mentioned lever end having a cam portion to engage said lever catch, and a roller journaled in and carried by the lever catch for eneasing the cam portion in the lever whereby the lever catch will ride upwardly and over the last mentioned lever end.

4.. A stop motion attachment as in claim 1, said lever actuating means including a stud swivelly supported on the bracket, a rod extending reciprocably through said stud and supported thereby parallel to the direction of travel of the movable machine part, a lever catch adjustably mounted on said rod, adjacent one end thereof,

, and having a portion depending from the rod,

means for limiting the sliding movement of said rod relatively to the stud, said lever catch being disposed to ride over the last mentioned end of the lever when the movable machine part travels a predetermined distance in one direction during its reciprocating movement, said lever catch and rod rocking with the stud relatively to the bracket in passing over the last mentioned lever end and thereafter resuming a position with the lever catch disposed on the opposite side of said lever end and said lever end being actuated by reciprocating movement of the movable machine part in one direction after the adjustable stop means has restricted the sliding movement of the rod in the stud and whereupon the last mentioned lever end is engaged and actuated by said lever catch, spring means connected to said lever for urging th first mentioned end thereof away from the push button, and a second spring means connected to the lever catch and to said stud and urging the lever catch toward the stud, said second' spring means being weaker than the first spring means and functioning to cause the lever catch to move back over the last mentioned lever end after said lever has been rocked thereby for displacing the push button inwardly.

5. A stop motion attachment as in claim 1, said lever actuating means including a stud swivelly supported on the bracket, a rod extending reciprocably through said stud and supported thereby parallel to the direction of travel of the movable machine part, a lever catch adjustably mounted on said rod, adjacent one end thereof, and having a portion depending from the rod, means for limiting the sliding movement of said rod relatively to the stud, said lever catch being disposed to ride over the last mentioned end of the lever when the movable machine part travels a predetermined distance in one direction during its reciprocating movement, said lever catch and rod rocking with the stud relatively to the bracket in passing over the last mentioned lever end and thereafter resuming a position with the lever catch disposed on the opposite side of said lever end and said lever end being actuated by reciprocating movement of the movable machine part in one direction after the adjustable stop means has restricted the sliding movement of the rod in the stud and whereupon the last mentioned lever end is engaged and actuated by said lever catch, a bracket mounted on the supporting member, a housing supported by said bracket, a pair of lever elements pivotally mounted in said housing intermediate of their ends, means connecting the adjacent ends of said lever elements whereby said lever elements will swing in unison in opposite directions, one of said lever elements having an outer end disposed to engage the push button and normally spaced therefrom, and a third section of said stop motion attachment detachably and adjustably mounted on said movable machine part and including a head adjustably supported relatively thereto and normally disposed in an inoperative position, said head being disposed to strike the opposite, outer end of th other lever element when the movable machine part is forcibly projected in one direction for rocking the lever elements whereby the out r end of the other lever element will strike and project the push button inwardly to a circuit interrupting position.

6. A double action stop motion attachment for spinning frames and twisters comprising a supporting member adapted to be detachably and adjustably mounted on a stationary machine part, a normally closed electric switch mounted on said supporting member having a push button normally disposed in a projected position and which is displaceable inwardly for moving the switch to a circuit interrupting position, lever means having one end disposed adjacent to and normally spaced from the push button when said push button is in a projected position, a lever support on which the lever means is fulcrumed; a lever actuating unit including a lever engaging element, and means for supporting said lever engaging element adjustably on and relatively to a movable part of the spinning frame or twister whereby said element will engage the opposite end of said lever means when said movable part is displaced a predetermined distance in one direction for rocking the lever means to cause its first mentioned end to strike and displace the push button inwardly to a circuit interrupting position.

7. A stop motion attachment as in claim 6, said lever engaging element being swingably supported by its mounting means relatively to said movable machine part and including cam means disposed to engage a portion of the last mentioned end of said lever means to ride over said end when displaced in one direction with the movable part and for rocking the lever means when displaced in the opposite direction by a reciprocating motion of said movable part for displacing the push button inwardly.

8. A stop motion attachment for spinning frames and twisters comprising a supporting member adapted to be mounted on a stationary part of a spinning frame or twister, an electric switch mounted on the supporting member having a normally projected push button, said switch being normally disposed in a circuit closing position and said push button being displaceable inwardly to cause the switch to assume a circuit interrupting position, lever means having one end normally spaced outwardly from the push button switch in its projected position, lever mounting means on which said lever means is fulcrumed at a point spaced from its ends, a lever actuating unit including a lever actuating element adapted to be detachably and adjustably supported on a reciprocably movable machine part which travels in one direction relatively to the machine, means for reciprocably and swingably supporting said lever engaging element relatively to the movable machine part and in a position to contact the other end of said lever means during normal travel of the'movable machine part, cam means on the lever engaging element to cause it to ride over the last mentioned end of the lever means during movement of said movable machine part in one direction and to engage behind said last mentioned end of the lever means during movement of the movable machine part in the opposite direction for rocking said lever means in a direction to cause its first mentioned end to engage and displace the push button inwardly to a circuit interrupting position.

9. A stop motion attachment as in claim 8, and spring means connected to said lever actuating element to cause it to swing upwardly over the last mentioned end of the lever means and to resume its initial position after the lever means is actuated thereby and moved to a tilted position.

10. A stop motion attachment as in claim 8, and spring means connected to said lever actuating element to cause it to swing upwardly over the last mentioned end of the lever means and to resume its initial position after the lever means is actuated thereby and moved to a tilted position, and a spring connected to said lever means for returning it to its initial position out of engagement with the push button after the lever engaging element is disengaged therefrom by its spring means.

11. A double action stop motion attachment for spinning frames and twisters comprising a supporting member adapted to be detachably and adjustably mounted on a stationary machine part, a normally closed electric switch mounted on said supporting member having a movable switch part displaceable in one direction for moving the switch to a circuit interrupting position, lever means having one end disposed adjacent to and normally spaced from said movable switch part when the switch is in a circuit closing posi tion, a lever support on which the lever means is fulcrumed; a lever actuating unit including a lever engaging element, and means supporting said lever engaging element on a movable part of the spinning frame or twister for engagement with the opposite end of said lever means when said movable part is displaced a predetermined distance in one direction for rocking the lever means to cause its first mentioned end to engage and displace said movable switch part to a position to open the switch.

JOSEPH B. DALTON.

No references cited. 

